This report is an extension of the authors' earlier studies on horizontal-tube film-type evaporator-condenser desalination units where evaporation takes place outside and condensation occurs inside the conduits, and on the transfer characteristics of rivulets flowing on straight-edged grooves. The minimum flow rates required for full wetting and the maximum (flooding) flow rates are defined. The corresponding limiting average heat transfer coefficients give the desired operation range as a function of the flow rates and the dimensions of the grooves. The theoretical tool is then extended to yield the overall heat transfer coefficients for the simultaneous evaporation on the grooved side and condensation on the smooth side of elliptical conduits. Comparison with experimental data, though satisfactory, brings out the lack of reliable wettability data in real systems.
|Number of pages||10|
|State||Published - 1978|
|Event||Int Symp on Fresh Water from the Sea, 6th, 205th Event of the Eur Fed of Chem Eng, Las Palmas, Grand Canary - Spain|
Duration: 17 Sep 1978 → 22 Sep 1978
|Conference||Int Symp on Fresh Water from the Sea, 6th, 205th Event of the Eur Fed of Chem Eng, Las Palmas, Grand Canary|
|Period||17/09/78 → 22/09/78|